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- Black Darter Tetra
- Black Devil Stingray
- Black Diamond Gold Piranha
- Black Driftwood Catfish
- Black Fin Cichlid
- Black Fin Clownfish
- Black Fin Cory
- Black Fin Damsel
- Black Fin Shark
- Black Finned Doradid
- Black Finned Triggerfish
- Black Ghost
- Black Ghost Knife
- Black Ghost Knife Fish
- Black Ghost Knifefish
- Black Headed Filefish
- Black Headed Leatherjacket
- Black Khuli Loach
- Black Knifefish
- Black Labeo
- Black Lampeye
- Black Lancer
- Black Lancer Catfish
- Black Leopard Wrasse
- Black Lined Loach
- Black Lined Rainbowfish
- Black Longnose Tang
- Black Longspine Urchin
- Black Mangrove Cichlid
- Black Manguruyú
- Black Molly
- Black Morpho Tetra
- Black Nasty Cichlid
- Black Neon Tetra
- Black Occy
- Black Pacu
- Black Patch Triggerfish
- Black Phantom Tetra
- Black Piranha
- Black Pyramid Butterfly
- Black Pyramid Butterflyfish
- Black Ray
- Black Razorfish
- Black River Puffer
- Black Ruby Barb
- Black Saddle Pufferfish
- Black Sail Cory
- Black Sailfin
- Black Sailfin Blenny
- Black Sea
- Black Shark
- Black Sharkminnow
- Black Skirt Tetra
- Black Small Fighter
- Black Spiny Ashiura Pleco
- Black Spot Angelfish
- Black Spot Barb
- Black Spot Surgeonfish
- Black Spot Tang
- Black Spotted Cory
- Black Spotted Starfish
- Black Stripe Dwarf Cichlid
- Black Talking Catfish
- Black Tetra
- Black Tiger Barb
- Black Tiger Prawn
- Black Tiger Shrimp
- Black Toraja Goby
- Black Triggerfish
- Black Wedge Tetra
- Black Widow Tetra
- Black Widow tetra
- Black Winged Hatchetfish
- Black and White Heniochus
- Black and Yellow Butterflyfish
- Black banded leporinus
- Black bar chromis
- Black ear Wrasse
- Black ghost knife
- Black moor
- Black spot
- Black water
- Black widow tetra
- Blackback Butterflyfish
- Blackbanded Soldierfish
- Blackbar Triggerfish
- Blackbarred Limia
- Blackbelly Limia
- Blackbelly Triggerfish
- Blackbelt Cichlid
- Blackblotch Butterflyfish
- Blackcap Basslet
- Blackcap Gramma
- Blackchest Shrimpgoby
- Blackchin Tilapia
- Blackear Pacu
- Blackear Wrasse
- Blackfin Coral Goby
- Blackfin Coralfish
- Blackfin Dartfish
- Blackfin Halftooth
- Blackfin Pearl Killifish
- Blackfin Pearlfish
- Blackfin pearlfish
- Blackfinned Clownfish
- Blackgullet Cichlid
- Blackhead Minnow
- Blacklance Catfish
- Blacklancer Catfish
- Blackline Apisto
- Blackline Penguinfish
- Blackline Rasbora
- Blacklip Butterfly
- Blacknosed Butterflyfish
- Blacksaddled Toby
- Blackseam Cichlid
- Blackskirt tetras
- Blackspine Surgeonfish
- Blackspot Angelfish
- Blackspot Lyretail Angelfish
- Blackspot Surgeonfish
- Blackspotted Puffer
- Blackspotted Toadfish
- Blackspotted Topminnow
- Blackstripe Cardinalfish
- Blackstripe Cory
- Blackstripe Pencilfish
- Blackstripe Topminnow
- Blacktail Angelfish
- Blacktail Goby
- Blackthroat Cichlid
- Blackwater
- Blackwedged Butterflyfish
- Blackwing Hatchetfish
- Blackworms
- Bladder Snail
- Blanketweed
- Blastomussa Coral
- Blastomussa merletti
- Bleak
- Bleeding Heart Tetra
- Bleher's Rainbowfish
- Blenniidae
- Blenny
- Blind Cave Tetra
- Blind Cavefish
- Blind Swamp Eel
- Bloat
- Bloch's Catfish
- Blochii Tang
- Blockhead Cichlid
- Blonde Bulldog Pleco
- Blonde Naso Tang
- Blonde Orangespine Unicornfish
- Blonde Rubber Pleco
- Blonde Rubbernose Pleco
- Blood Characin
- Blood Fish
- Blood Parrot
- Blood Parrot Cichlid
- Blood Shrimp
- Blood Spot Anthias
- Blood Stargrass
- Blood Worms
- Blood red
- Blood worm
- Blood worms
- Bloodfin
- Bloodfin Tetra
- Bloodworm
- Bloodworms
- Bloom
- Blotched Anthias
- Blotched Pyrrhulina
- Blotched Snakehead
- Blotched Upsidedown Catfish
- Blue-Banded Goby
- Blue-Barred Barb
- Blue-Barred Pygmy Sunfish
- Blue-Eye Catfish
- Blue-Eye Cichlid
- Blue-Eyed Pleco
- Blue-Eyed Red Fin Pleco
- Blue-Faced Angelfish
- Blue-Freckled Cichlid
- Blue-Legged Hermit Crab
- Blue-Lined Tang
- Blue-Lip Anemonefish
- Blue-Lipped Blockhead
- Blue-Red Columbian Tetra
- Blue-Spot Rockcod
- Blue-Spotted Jawfish
- Blue-Spotted Mudskipper
- Blue-Spotted Puffer
- Blue-Spotted Stingray
- Blue-Streak Cleaner Wrasse
- Blue-Striped Dottyback
- Blue-Throat Trigger
- Blue-White Labido
- Blue-banded Surgeonfish
- Blue-eye Panaque
- Blue-finned triggerfish
- Blue-lined Cardinalfish
- Blue-lined rabbitfish
- Blue-streak Cleaner Wrasse
- Blue-striped Cardinalfish
- Blue-throat trigger
- Blue/Green Mandarinfish
- Blue Acara
- Blue Ahli
- Blue Angelfish
- Blue Apistogramma
- Blue Arowana
- Blue Banded Ghost Shrimp
- Blue Betta
- Blue Botia
- Blue Boxfish
- Blue Catfish
- Blue Cheek Dwarf Cichlid
- Blue Chin Triggerfish
- Blue Chromis
- Blue Chromis Damsel
- Blue Cichlid
- Blue Congo Tetra
- Blue Convict
- Blue Corydoras
- Blue Crayfish
- Blue Damsel
- Blue Damselfish
- Blue Danio
- Blue Devil Damselfish
- Blue Diamond Characin
- Blue Diamond Tetra
- Blue Doctorfish
- Blue Dolphin Cichlid
- Blue Dorid
- Blue Dot Grouper
- Blue Dot Jawfish
- Blue Dot Stingray
- Blue Dot Toby
- Blue Dragonet
- Blue Emperor Tetra
- Blue Eye Royal Dottyback
- Blue Eyed Cichlid
- Blue Eyed Puffer
- Blue Eyed Tropheus
- Blue Fin Pelvicachromis
- Blue Flame Tetra
- Blue Flash
- Blue Flasher Fairy Wrasse
- Blue Gold-Tip Cichlid
- Blue Gourami
- Blue Green Algae
- Blue Green Chromis
- Blue Green Damselfish
- Blue Gudgeon Dartfish
- Blue Gularis
- Blue Harlequin Shrimp
- Blue Head Wrasse
- Blue Jaw Triggerfish
- Blue Johanni
- Blue Julie
- Blue King Angelfish
- Blue Knuckle Hermit Crab
- Blue Kurper
- Blue Leg Hermit Crab
- Blue Linckia
- Blue Loach
- Blue Lobster
- Blue Loreto Tetra
- Blue Lumphead
- Blue Lyretail
- Blue Mbuna
- Blue Moon Angelfish
- Blue Notho
- Blue One Spot Mouthbrooder
- Blue Panchax
- Blue Paradise Fish
- Blue Pearl Shrimp
- Blue Perch
- Blue Phantom Pleco
- Blue Rainbowfish
- Blue Ram
- Blue Razorfish
- Blue Reef Chromis Damsel
- Blue Ring Angelfish
- Blue Salmon Catfish
- Blue Sea Star
- Blue Shark Catfish
- Blue Spiny Lobster
- Blue Spot Betta
- Blue Spotted Goby
- Blue Spotted Grouper
- Blue Spotted Puffer
- Blue Spruce Caulastrea
- Blue Star
- Blue Star Leopard Wrasse
- Blue Starfish
- Blue Surgeonfish
- Blue Tang
- Blue Tang Surgeonfish
- Blue Tetra
- Blue Throat Triggerfish
- Blue Tiger Shrimp
- Blue Tilapia
- Blue Torpedo Catfish
- Blue Triggerfish
- Blue Tuxedo Urchin
- Blue Velvet Nudibranch
- Blue Whale Catfish
- Blue Yabby
- Blue and Red Fairy Wrasse
- Blue legged hermit crab
- Blue loach
- Bluebarred Pygmy Sunfish
- Blueberry Tetra
- Blueface Angelfish
- Bluefin Damselfish
- Bluefin Killie
- Bluefin Killifish
- Bluefin Notho
- Bluefin Nothobranch
- Bluefin Topminnow
- Bluefin Unicornfish
- Bluegill
- Bluegrey Mbuna
- Bluehead Butterflyfish
- Bluehead Fairy Wrasse
- Bluehead Wrasse
- Bluelined Sea Bream
- Bluemouth Cichlid
- Bluering Angelfish
- Blueside Wrasse
- Bluespine Unicornfish
- Bluespot Cardinalfish
- Bluespot Damsel
- Bluespot Stingray
- Bluespotted Corydoras
- Bluespotted Ribbontail Stingray
- Bluespotted Sunfish
- Bluestreak Cleaner Wrasse
- Bluestreak Cleanerfish
- Bluestripe Clownfish
- Bluestripe Pipefish
- Blunt-Head Cichlid